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Molybdenum-doped porous silicon-carbon composite material, preparation method thereof and lithium ion battery

A technology of carbon composite materials and composite materials, applied in the preparation/purification of carbon, secondary batteries, battery electrodes, etc., can solve problems affecting the rate and power performance, material conductivity deviation, etc., to avoid structural collapse and reduce expansion , the effect of high specific capacity

Active Publication Date: 2020-09-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the expansion of silicon materials is still high, and the conductivity deviation of the material affects its rate and power performance

Method used

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  • Molybdenum-doped porous silicon-carbon composite material, preparation method thereof and lithium ion battery

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Embodiment 1

[0062] The invention provides a molybdenum-doped porous silicon-carbon composite material, the molybdenum-doped porous silicon-carbon composite material includes porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, and the molybdenum oxide and nano-silicon are loaded on the on graphene and are connected to graphene through chemical bonds;

[0063] Based on the total mass of the composite material being 100%, the mass percentage of porous nano-silicon is 69%, the mass percentage of molybdenum oxide is 2%, the mass percentage of graphene is 1%, and the amorphous carbon The mass percentage composition is 28%.

[0064] The method comprises the steps of:

[0065] 1) Preparation of the porous nano-silicon material of amination:

[0066] 5g nano silicon is added to 100mL, in the mixed acid solution of 10wt% (the volume ratio of the hydrochloric acid that the preparation mixed acid solution adopts and the sulfuric acid are 1:1, promptly the two are respectively 50mL...

Embodiment 2

[0072] The invention provides a molybdenum-doped porous silicon-carbon composite material, the molybdenum-doped porous silicon-carbon composite material includes porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, and the molybdenum oxide and nano-silicon are loaded on the on graphene and are connected to graphene through chemical bonds;

[0073] Based on the total mass of the composite material as 100%, the mass percentage of porous nano-silicon is 78%, the mass percentage of molybdenum oxide is 1.5%, the mass percentage of graphene is 0.5%, and the amorphous carbon The mass percentage content is 20%.

[0074] The method comprises the steps of:

[0075] 1) Preparation of the porous nano-silicon material of amination:

[0076] Add 1g of nano-silicon to 100mL, and the concentration is in the mixed acid solution of 10wt% (the volume ratio of hydrochloric acid and sulfuric acid used to prepare the mixed acid solution is 1:1, that is, the two are respectively 5...

Embodiment 3

[0082]The invention provides a molybdenum-doped porous silicon-carbon composite material, the molybdenum-doped porous silicon-carbon composite material includes porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, and the molybdenum oxide and nano-silicon are loaded on the on graphene and are connected to graphene through chemical bonds;

[0083] Taking the total mass of the composite material as 100%, the mass percentage of porous nano-silicon is 60%, the mass percentage of molybdenum oxide is 10%, the mass percentage of graphene is 5%, and the amorphous carbon The mass percentage composition is 25%.

[0084] The method comprises the steps of:

[0085] 1) Preparation of the porous nano-silicon material of amination:

[0086] 10g nano-silicon is added to 100mL, and concentration is in the mixed acid solution of 10wt% (the volume ratio of the hydrochloric acid and the sulfuric acid that the preparation mixed acid solution adopts is 1:1, promptly both are resp...

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Abstract

The invention discloses a molybdenum-doped porous silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The molybdenum-doped porous silicon-carbon composite material comprises porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, the molybdenum oxide and the porous nano-silicon are loaded on the graphene and are connected with the graphene through chemical bonds. According to the molybdenum-doped porous silicon-carbon composite material disclosed by the invention, molybdenum oxide and graphene are doped between the silicon-carbon materials,and the synergistic effect among the molybdenum oxide, the graphene and the silicon-carbon materials is exerted, so that the specific capacity and the cycle performance of the material are improved while the conductivity of the material is improved and the expansion is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and relates to a molybdenum-doped porous silicon-carbon composite material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Silicon carbon anode materials are used in high-end digital, power batteries and other fields due to their advantages of high specific capacity, wide range of material sources and high safety performance. One of the measures to improve the rate performance and cycle performance of silicon-carbon materials is the encapsulation and doping modification of materials. The current traditional doping is mainly to dope materials such as graphene with high conductivity on the surface or inside of silicon carbon through physical doping and other technologies, or to dope materials with high conductivity such as copper and nickel to improve the conductivity of the material. and reduce its expansion. For example, CN109841814A disclos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525C01B32/05C01B33/021
CPCC01B33/021C01B32/05H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵晓锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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